/**
 * Tetris game function
 */
var Tetris = function() {
   /**
    * Creating figure on start point
    */
   var spot = function() {
      
   };
   /**
    * Moving figure down
    */
   var step = function() {
      
   };
   /**
    * Show score
    */
   var score = function() {
      
   };
   /**
    * Start game
    */
   var start = function() {
      
   };
   /**
    * Stop game
    */
   var stop = function() {
      
   };
   /**
    * Pause game
    */
   var pause = function() {
      
   };
};